K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2019-09-16T15:12:49.203290Z
K 7
svn:log
V 495
Fix a race in vm_page_dequeue_deferred_free() after r352110.

This function loaded the page's queue index before setting PGA_DEQUEUE.
In this window the page daemon may have deactivated the page, updating
its queue index.  Make the operation atomic using vm_page_pqstate_cmpset();
the page daemon will not modify the page once it observes that PGA_DEQUEUE
is set.

Reported and tested by:	pho
Reviewed by:	alc, kib
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D21639

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